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authorVincent Whitchurch <vincent.whitchurch@axis.com>2022-02-04 18:52:41 +0300
committerMark Brown <broonie@kernel.org>2022-02-08 16:38:10 +0300
commite2a01b4e8806087743e5ee42f9dcedfc741d4112 (patch)
tree670e7b5a4f7566d7f127b4f67bed4c80d79a7fc1 /drivers/regulator/tps6286x-regulator.c
parent2f04aa69ab5c5c40d2e3e51fd73ce2ecb651e9ba (diff)
downloadlinux-e2a01b4e8806087743e5ee42f9dcedfc741d4112.tar.xz
regulator: Add support for TPS6286x
TI's TPS62864/TPS6286/TPS62868/TPS62869 are high-frequency synchronous step-down converters controlled via I2C. There are differences in the electrical characteristics and packaging between the variants, but the register interfaces are identical. Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> Link: https://lore.kernel.org/r/20220204155241.576342-3-vincent.whitchurch@axis.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator/tps6286x-regulator.c')
-rw-r--r--drivers/regulator/tps6286x-regulator.c159
1 files changed, 159 insertions, 0 deletions
diff --git a/drivers/regulator/tps6286x-regulator.c b/drivers/regulator/tps6286x-regulator.c
new file mode 100644
index 000000000000..e29deda30d75
--- /dev/null
+++ b/drivers/regulator/tps6286x-regulator.c
@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright Axis Communications AB
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/of_regulator.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/driver.h>
+
+#include <dt-bindings/regulator/ti,tps62864.h>
+
+#define TPS6286X_VOUT1 0x01
+#define TPS6286X_VOUT1_VO1_SET GENMASK(7, 0)
+
+#define TPS6286X_CONTROL 0x03
+#define TPS6286X_CONTROL_FPWM BIT(4)
+#define TPS6286X_CONTROL_SWEN BIT(5)
+
+#define TPS6286X_MIN_MV 400
+#define TPS6286X_MAX_MV 1675
+#define TPS6286X_STEP_MV 5
+
+static const struct regmap_config tps6286x_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int tps6286x_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+ unsigned int val;
+
+ switch (mode) {
+ case REGULATOR_MODE_NORMAL:
+ val = 0;
+ break;
+ case REGULATOR_MODE_FAST:
+ val = TPS6286X_CONTROL_FPWM;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(rdev->regmap, TPS6286X_CONTROL,
+ TPS6286X_CONTROL_FPWM, val);
+}
+
+static unsigned int tps6286x_get_mode(struct regulator_dev *rdev)
+{
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(rdev->regmap, TPS6286X_CONTROL, &val);
+ if (ret < 0)
+ return 0;
+
+ return (val & TPS6286X_CONTROL_FPWM) ? REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
+}
+
+static const struct regulator_ops tps6286x_regulator_ops = {
+ .enable = regulator_enable_regmap,
+ .disable = regulator_disable_regmap,
+ .set_mode = tps6286x_set_mode,
+ .get_mode = tps6286x_get_mode,
+ .is_enabled = regulator_is_enabled_regmap,
+ .set_voltage_sel = regulator_set_voltage_sel_regmap,
+ .get_voltage_sel = regulator_get_voltage_sel_regmap,
+ .list_voltage = regulator_list_voltage_linear,
+};
+
+static unsigned int tps6286x_of_map_mode(unsigned int mode)
+{
+ switch (mode) {
+ case TPS62864_MODE_NORMAL:
+ return REGULATOR_MODE_NORMAL;
+ case TPS62864_MODE_FPWM:
+ return REGULATOR_MODE_FAST;
+ default:
+ return REGULATOR_MODE_INVALID;
+ }
+}
+
+static const struct regulator_desc tps6286x_reg = {
+ .name = "tps6286x",
+ .of_match = of_match_ptr("SW"),
+ .owner = THIS_MODULE,
+ .ops = &tps6286x_regulator_ops,
+ .of_map_mode = tps6286x_of_map_mode,
+ .regulators_node = of_match_ptr("regulators"),
+ .type = REGULATOR_VOLTAGE,
+ .n_voltages = ((TPS6286X_MAX_MV - TPS6286X_MIN_MV) / TPS6286X_STEP_MV) + 1,
+ .min_uV = TPS6286X_MIN_MV * 1000,
+ .uV_step = TPS6286X_STEP_MV * 1000,
+ .vsel_reg = TPS6286X_VOUT1,
+ .vsel_mask = TPS6286X_VOUT1_VO1_SET,
+ .enable_reg = TPS6286X_CONTROL,
+ .enable_mask = TPS6286X_CONTROL_SWEN,
+ .ramp_delay = 1000,
+ /* tDelay + tRamp, rounded up */
+ .enable_time = 3000,
+};
+
+static const struct of_device_id tps6286x_dt_ids[] = {
+ { .compatible = "ti,tps62864", },
+ { .compatible = "ti,tps62866", },
+ { .compatible = "ti,tps62868", },
+ { .compatible = "ti,tps62869", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tps6286x_dt_ids);
+
+static int tps6286x_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &i2c->dev;
+ struct regulator_config config = {};
+ struct regulator_dev *rdev;
+ struct regmap *regmap;
+
+ regmap = devm_regmap_init_i2c(i2c, &tps6286x_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ config.dev = &i2c->dev;
+ config.of_node = dev->of_node;
+ config.regmap = regmap;
+
+ rdev = devm_regulator_register(&i2c->dev, &tps6286x_reg, &config);
+ if (IS_ERR(rdev)) {
+ dev_err(&i2c->dev, "Failed to register tps6286x regulator\n");
+ return PTR_ERR(rdev);
+ }
+
+ return 0;
+}
+
+static const struct i2c_device_id tps6286x_i2c_id[] = {
+ { "tps62864", 0 },
+ { "tps62866", 0 },
+ { "tps62868", 0 },
+ { "tps62869", 0 },
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, tps6286x_i2c_id);
+
+static struct i2c_driver tps6286x_regulator_driver = {
+ .driver = {
+ .name = "tps6286x",
+ .of_match_table = of_match_ptr(tps6286x_dt_ids),
+ },
+ .probe = tps6286x_i2c_probe,
+ .id_table = tps6286x_i2c_id,
+};
+
+module_i2c_driver(tps6286x_regulator_driver);
+
+MODULE_LICENSE("GPL v2");